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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2c31161021d29a9f7b4c113170d1771f0ba6cf4cb33ae9b080f55ab14f7bd4' 
  AND token = 'Sp178NFgXLuPXJQZx8MWOmdX3eofM9OtUEzU+KSNJXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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