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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cee40697c2a775330e20bc3cced686a825e43cd447c0f371ffe5b2d2ab3d6d' 
  AND token = 'dN+V5lKjvMc98ywp33QqkiL0i5Si9/h8etKEf6M/dxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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