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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b2b62365f7f35ae799cba5013b7d32907f043c264f5f37b2c4449aaf0b1455' 
  AND token = 'pekyZaSzi1rMXYDzjL4AG/1qDcUUx9EML2a7mEUyOxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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