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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be524089ab95409b9a45abc9d3d9e4508b4a7926cd1619f2242d801420c10ed1' 
  AND token = '7Mad3gz6Orofx+DjZOAYFmn1bhWoy09VourJmPFRyXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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