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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e2d68091fec652d182d9baab147e2d4608cb4674bc31e092293726236758c0' 
  AND token = 'ALILFN+B6qPrtbtEAusakMPhp1pjijaVA6XG1F77f4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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