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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fd6af39572c1108d02ab861db4069d29cbb09425a6b48da2c463194064303a' 
  AND token = 'bz09v5euEveD/UuR8GHioMMSW5aXHR0gSrPuTZSjdZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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