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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36009bfcef35c42ffb7299078bb0ef4e1f87fc2ce401adf1b20b798cda0cd5cb' 
  AND token = 'geoOlib95APW8xkOfP6eA6fGPE950tfIqnmprgKwBa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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