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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dab8be6fc6f6aea44e2e0a3108e2a5976950e90bba68e39686069d71414b83' 
  AND token = 'iF8pz4sHWKS0xKg+UiRfA0Q5zym+U21WNjDRoHn63DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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