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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0105dae2e4831da4464c1688dc5746cf621362f8984378d414a9468b604c17c5' 
  AND token = 'x3ZB3vhgLNfedEEvYqrdlQHI3oXagFNDFGIWmFf0Gfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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