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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770ebf0e2918fc912314a652726b3d0a233ba7dc71f75cbc242b2a7a814de7ed' 
  AND token = 'CLeX3hIYuBdIPBYgH7HPFX882ZhK0HHSU2xsF2DlBLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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