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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa87d12d4fcf1d554ea8103e8ecfdba98b4e41ee7e55d33f06eb25da40f7302' 
  AND token = 'Kx6OEqhy6I7Q0/WSHBO0XQMJFTbpRBWQuOXI5/vLgX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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