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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4115eaa4000958eeecd99fd556cba041c445d2c9c700e9913239e338fd53bbb8' 
  AND token = 'pkiNj66bnkY81wvl8Fclx+vx5fJqg+0j/lMOHaLLjQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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