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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b8294da3be7ddec61b2047ea8ef363d0e2a0784a7de928c8f412ec46323bb9' 
  AND token = 'wVoXfsp87lcdiDe9R5vfX04pZ8cfzGGHCbsYicveTP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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