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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca93540d386d264c28d35ce9a8abf7489dffbab3e8949171432e742bc592b92' 
  AND token = 'PQQY1fSgDdOY7mcosoBwKSVYVYUgHHIQll18MRJQl8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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