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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe083d3d0b5f01a16c5add594b346a33734e648dfb782ef52777f0f1eeb05605' 
  AND token = 'BjACEDKGCeKB66KFTzeV738slrccfSQLgKDbes5kqRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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