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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d45ce894d98efe211010ade09616174bc205a327a9ca0b1b5571bff1fcb7b78' 
  AND token = 'Jkti67CqaGXAsALgsWK+BScAQJodGquFGNSEiHJawxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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