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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea747c9ee1eadf2a4c3ac5cb3cada46571b241f7b8e0d16d61da86ca6981997' 
  AND token = 'GOjFygoXuERAEHPeOOWZAzLdaHUxEQ9s/hS/YD2zL0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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