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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540c90e3ea77f9f3f26d780693c97a558176bdc417c143fc4561a3d6299cebc5' 
  AND token = 'qyjmvK/Q5SI5p0sV8mO2N0XbcLnSKBjgX71/UP6LlWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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