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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7f065f3bf2f6a573d29f8599a3fae263554fb450712fc801567c92d4e84afc' 
  AND token = 'bSr9zQ7gI2zp104wfcL8+KDaufwOviAF37ESj+yFREQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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