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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3d33c2efe6c077a65bff65fdc4c784164d046bec5be5d9909634bebc7839ab' 
  AND token = 'dgdo7aEYpiOIaUHdsCDew1QlLiCj4wZx75kk6/OwLgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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