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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919043d4c6fd8d3e6ae78243903ea1dfe845f1b4360b4e2e43ad9408bce42ed0' 
  AND token = 'T4tTMXskp2EY7D639lrxFi1lQxeQdAGc4Yz9xQkfuMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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