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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcc35c23f8d3739cf10faac15294eff9ad78902dfb9e745249b6942593f5c31' 
  AND token = 'Qgk5tK8KVsw3p/iolhR8CtL+xt6a0NQld0UWN4MerIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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