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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63e6980f78c03b75e05dec7cb1819fb6da13aeda29e4bfe9334bf8755216a11' 
  AND token = 'sfIi31gFlSP5t0oPlhBMuHvUMeBA5B6+TBw87Bj7m4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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