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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e767f96dde4e9f686fe6e1103e10e0a92e0a3b4d7ab9f41c97cb2f80189f5d0' 
  AND token = 'C9Ok0E7R07ySvYLowkGq5JcNqn21p+hzbT8XapP7bqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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