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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4270d7f89249919d5e11b706e573f6bb0ba8176a63f592fa41a17b0f663179' 
  AND token = 'u1EZHWj7QuX0zPxPDp8IPygh2yoHtt3yOAUmEBFPVK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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