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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f95b1600f794b069c8109b33a91160f60cc136bb70142eb6157d4b33b750d0' 
  AND token = '2UqTbsK/nXtQEDLv7Iua3sPJZDrnbFaciv5B8idku+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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