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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6550cb17882c33c1dfbb49fe41e2e934d28040ce50d7addb19898f50753a3a' 
  AND token = 'ZMEqyzDxq2qd1w38D4cTH3+IoIgLb3hOrsergRCs6jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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