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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4031a657f859319f0e09e2961116ba3b70d974ceb06477c8420737a24a2c200' 
  AND token = 'F7tkS+4akau/RNaaer+AwRkJ/tjXBDBE2L8LQnj0DRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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