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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db5475f9620045c29196b6d2d76d21a4d170ad0c6c95aadc9599d296e1eeaae' 
  AND token = '16jqyr9bvqW+QrlU1EIjh9TtlWubUShj+t5tScB2As0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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