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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0419a77db84ef78d4cf5e17431cc29c7fe3af26905b637e87a11d72f114f5a5' 
  AND token = 'pCkI1w5s3yTbri20Aj9C2xyL/HRb1st2cRSSk+NRazo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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