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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79bd3df84eb2e2d3ffef3f3dca4ef4c204f83fff1d3d98d94a75ebbf83a5828' 
  AND token = 'iqTirr9zFtIi0+7gs1rF00F6be7Qz1ZXBCgAIEOqEp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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