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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fd9ab369e45d7eace287c9df43836d61899b8adcf64363c200819c3152ee6a' 
  AND token = 'au1vvBM3KkEyD9+q5IygWEy3+goUxmS3bpIi7xOPYKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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