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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12275898b83de85b6c76d9250c1900b0dd58df05a848ff48eeccf68b8f807d8' 
  AND token = 'JePOZUo9DOWGuTiD4IN59CqyQ9IAxiwotWk3dJEB5Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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