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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7045b5e0876073b7e878d9f33abcf62d8fe9ff7b462f254913c08ab8f9a93c' 
  AND token = 'QpbVcbA7zKd5xVpJjepSCMzPop//RupT04zzRMXCxZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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