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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a628ba10566cb05b757dd88f7a729d19cf03e4e6b76ade0b43c9ad10ee1af5e' 
  AND token = 'wYFCLsNbIgAWUm+0YeAwihvQEKk1pKTgEKa1ATBPzT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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