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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba3f6af31821f315640a16bc6895b8afd47eed5bfdb951526aff6e6a0186bb3' 
  AND token = '/BorI83eYh/5oSgAHYlDP42PCR89hrHajJcs7pApkDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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