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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1b7317715b9813e93237d546c277f4e28298d611dec94210f287ce3b1f7096' 
  AND token = 'T1bQnvoriiicpm/c1w0GmT3hn/FCN/wkhuzhWF5ABMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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