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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afe1eed848f6b2c51d1ea7e57afb856b7064f1ac9714ac2a465384112d9bc97' 
  AND token = '6aPhriyj8dzH9mzioR5Li8kC2UV0KeOt9N7U7dOs/Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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