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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c212bba57d2efc9a07ff1a8ed4983b92999e15eb95cfb60caf9d2cc2c7edecf0' 
  AND token = 'NBIJBfEVhcvHLprllvKkLwUIKiETFMQs+V9IKiuvo+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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