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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c115a6d6658d51f4b2fbf939efd24c9b8a533e2d28c4667a0b5adb4f736a22e' 
  AND token = 'pi0TzMNlatbxYzxj8OPADj9FdAgkSToli/rkdpGW3+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}