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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d71a1c2a3fa67f321117ab45d73a606dcc01f1e9fa35283f0ac238497475d26' 
  AND token = '5SirKby6xU5PP41KeOpL5P70fOYA3Vs8uV8qdheF9fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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