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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bda2f09b2ba26c9afa7741e60c4121ca547dacbd7f4ea5c34cde25498e2308' 
  AND token = '5hl8RDXEmnKaQ/wtbVqCUAiy3bEiXlallD03k14tx9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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