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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c2e733b40c2e4e8759bdbf0279222ab0f5e47dd156acd0a0d10f040b36b02f' 
  AND token = 'eI3MDK20Q/ZGrqOx3lf3Z/A+SJwxb4M2oYr6G+FUX5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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