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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad77cd3352c8fdf5f04b70594019f300cc562325251ce251fee3db8b0614911d' 
  AND token = 'FlBLTq4uGryxbZ90mPrasFr8vyf/0Zp2s8Y/LymdqVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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