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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9197ba46b1c60e8a71a65bdb6e7eb62bfc70ade2e5b50d0d0716123e305f0249' 
  AND token = 'UYqKyUCRAixxpnp4eYTmN7L/yPrByyC2pDaIp1yH0FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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