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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b13fcab2c19e2443b2ee964c4b4c366f739ec48f8dac490627cd0e7c93b72c6' 
  AND token = 'FUWvcD/87N3SnIX5ruv2fye9hkEDrUYY6cAx7RfCKRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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