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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5713a77669961309ad021eb3cc163415c9fce89532d8ca0218a95b27e8087a2' 
  AND token = 'FnehaNV6mKJxtCdrH4lNg9AVmSD6pj1j+kjYLKd74xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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