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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e76e2b595edd5154ea50456011c6d5c40a41980a7a8f0af2cdb0977ac2109e' 
  AND token = 'wUghZTO+BfW3CykLYWZoRDSWVHb6I/WNBV/PPELt3V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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