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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8700c0d097471954efe3510d4a5d53c2d02520a9e188727b2d59f46158aa3eb0' 
  AND token = 'uttO6u+Ro+qQuP14ImvyGGjaQ2E6Bd4RD7l/SRy18Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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