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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e99035e39b8b9e6c0c370739532cb1a524f165f45408d95af4983cfd1164088' 
  AND token = 'hAyW+TNpZIcvSTrIfLSLBcn+9yW755R5f9rdAKyLyN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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