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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1790819957f61d1e130f9e64fe578b49a39cafcae386f685ee7c8c5fa7f07d3d' 
  AND token = 'iIdyhh3g28gfUuL7lpk5jW1R49wYFKblwIk/Xybjsww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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